Brunost, a Norwegian cheese considered a delicacy, was being shipped in a truck that caught fire. No one was hurt in the incident, which firefighters were finally able to put out on Monday.

"This high concentration of fat and sugar is almost like petrol if it gets hot enough," Viggo Berg, a policeman, told Reuters.

As the website Nordic Nibbler explains, brunost is not technically a traditional cheese. It is made from the whey of goat’s milk and can contain up to 30 percent fat. It is described as having a “slightly salty and surprisingly sweet flavor with a hint of goat about it.”

The BBC reported that the truck’s driver noticed the cheese had caught fire and was forced to abandon the truck about 300 feet from the tunnel’s exit. Toxic fumes emanating from the smoldering brown cheese kept firefighters at bay for several days before they could attempt to extinguish the flames.

"I didn't know that brown cheese burns so well," added Kjell Bjoern Vinje, an official with the Norwegian Public Roads Administration.